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AQUISITIONS AND DISPOSITIONS - ASEETS HELD FOR SALE (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - CAD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Accounts receivable and other (current assets held for sale) | $ 154 | $ 424
Deferred amounts and other assets (long-term assets held for sale)1 | 4,841 | 1,190
Accounts payable and other (current liabilities held for sale) | (70) | (315)
Other long-term liabilities (long-term liabilities held for sale)2 | (430) | (34)
Net assets held for sale | 4,495 | 1,265
Property, plant and equipment, noncurrent | 4,100 | $ 1,100
Goodwill, noncurrent | 482 |
Deferred tax liabilities, noncurrent | $ 329 |

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